I'm so happy that, as a new little foster dog who had been a Puppy Mill br*eder for 12 years, that you've warmed up and come out of your shell to join me and the rest of the pack. It's so cute to see you learn how to be a dog and run outside and play, not to mention snuggle with me on the sofa! You'll turn into a little lap dog yet, sweetie.
And I'm really happy that you've decided to like your foster brothers and sister, even though they're 4x your size, and you can run under their bellies without touching. I know you'd really like your foster brother Lucas to play with you, since he looks most like you. It'd be good for him. But, sweetie, you need to think about your relative heights when nipping him to get him to play. Let's face it, the only place you can reach are, frankly, his dangly bits. Admittedly, he's had some of said bits removed, but, well, boys still don't like having their bits nipped. That's just not the best way to convince him to play with you.